CN109995392B - Magnetic coupling communication transceiver, magnetic coupling communication main chip and magnetic coupling communication system - Google Patents
Magnetic coupling communication transceiver, magnetic coupling communication main chip and magnetic coupling communication system Download PDFInfo
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- CN109995392B CN109995392B CN201711455395.4A CN201711455395A CN109995392B CN 109995392 B CN109995392 B CN 109995392B CN 201711455395 A CN201711455395 A CN 201711455395A CN 109995392 B CN109995392 B CN 109995392B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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Abstract
The invention relates to a magnetic coupling communication transceiver, a magnetic coupling communication main chip and a magnetic coupling communication system, wherein the magnetic coupling communication transceiver comprises: the modulation module is used for respectively forming a modulation signal for modulating the data signal on the carrier signal and a single-frequency carrier signal according to different states of the transmission control signal; the transmitting module is connected with the modulating module and used for converting the signal output by the modulating module into a current signal and outputting the current signal to the main end of the mutual inductor; and the receiving module is used for detecting the current of the main end of the mutual inductor so as to obtain a return signal of the chip to be isolated. The magnetic coupling communication transceiver, the main chip and the magnetic coupling communication system can simultaneously realize power supply and communication isolation, improve the system integration level and reduce the cost.
Description
Technical Field
The invention relates to the technical field of magnetic coupling communication, in particular to a magnetic coupling communication transceiver, a magnetic coupling communication main chip and a magnetic coupling communication system.
Background
In general, communication is performed between strong current and weak current signals, and physical isolation is generally required between a strong current sending end and a weak current receiving end, so in order to ensure stability and reliability of a system and communication, an electric meter system adopts optical coupling to realize communication isolation, and adopts DC-DC to realize power isolation.
In the prior art, the communication between an electric meter MCU (micro control unit) and a metering chip and a communication interface chip (such as an RS485 chip) is isolated by adopting optical coupling; and the power supply adopts DC-DC to realize power supply isolation.
However, this isolation approach is costly; low communication speed, large device area, unfavorable integration and the like.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a magnetic coupling communication transceiver, a main chip and a magnetic coupling communication system, so that the integration level and the stability of the magnetic coupling communication system are improved, and the system cost is saved.
In order to solve the above problems, the present invention provides a magnetic coupling communication transceiver for forming electrical isolation between a chip to be isolated and a transformer, comprising: the modulation module is used for respectively forming a modulation signal for modulating the data signal on the carrier signal and a single-frequency carrier signal according to different states of the transmission control signal; the transmitting module is connected with the modulating module and used for converting the signal output by the modulating module into a current signal and outputting the current signal to the main end of the mutual inductor; and the receiving module is used for detecting the current of the main end of the mutual inductor so as to obtain a return signal of the chip to be isolated.
Optionally, the modulation module modulates the data signal by using an FSK modulation protocol.
Optionally, the receiving module includes: the preprocessing unit is used for preprocessing a detection signal of the current of the main end of the mutual inductor; the amplifying unit is connected with the preprocessing unit and used for amplifying the signal output by the preprocessing unit; and the demodulation unit is used for demodulating the signal output by the amplification unit to obtain a return signal.
Optionally, the sending module provides power to the chip to be isolated by outputting a carrier signal to the main end of the transformer.
Optionally, the sending module includes: the control unit is used for carrying out digital logic processing on the signal output by the modulation module and outputting a digital control signal; and the conversion unit is connected with the control unit and used for outputting a current signal matched with the characteristics of the signal output by the modulation module under the control of the digital control signal.
Optionally, the conversion unit is an H-bridge full-bridge circuit or a half-bridge circuit.
Optionally, the power supply of the conversion unit is connected to the conversion unit through a resistor; the receiving module is connected to the connecting end of the resistor and the conversion unit.
In order to solve the above problem, the technical solution of the present invention further provides a magnetic coupling communication main chip, including: a micro control unit; the magnetic coupling communication transceiver is connected to the micro control unit, and is used for acquiring a data signal from the micro control unit, sending a control signal, and sending a return signal to the micro control unit.
In order to solve the above problem, a technical solution of the present invention further provides a magnetic coupling communication system, including: the magnetic coupling communication main chip; the main end of the mutual inductor is connected with the magnetic coupling communication main chip; and the magnetic coupling communication slave chip is connected with the slave end of the mutual inductor and is used for receiving a power supply and a data signal from the magnetic coupling communication master chip through the mutual inductor and sending a transmission signal back to the magnetic coupling communication master chip.
Optionally, the magnetic coupling communication slave chip includes: the rectification voltage stabilization module is connected with the secondary end of the mutual inductor and used for extracting a modulation signal from the current of the secondary end of the mutual inductor, rectifying the carrier current in the current of the secondary end of the mutual inductor and outputting a power supply signal; the demodulation module is connected with the rectification voltage-stabilizing module and is used for demodulating the modulation signal to obtain a data signal; and the load modulation module modulates the signal to be transmitted back in a load current modulation mode so as to change the current of the slave end of the mutual inductor.
Optionally, the rectifying and voltage stabilizing module includes: the rectification unit is used for extracting a modulation signal from the transformer slave end current and rectifying the carrier current in the transformer slave end current into a direct current signal; and the voltage stabilizing unit is connected with the rectifying unit and is used for stabilizing the voltage of the direct current signal output by the rectifying unit and outputting a power supply signal.
Optionally, the magnetic coupling communication slave chip further includes: and the functional module is connected with the voltage stabilizing unit, the demodulation module and the load modulation module and is used for acquiring a power supply signal from the voltage stabilizing unit, acquiring a data signal and a return control signal from the demodulation module and sending a signal to be returned to the load modulation module in a specific state of the return control signal.
Optionally, the functional module includes: a metering circuit or a communication circuit.
Optionally, the magnetic coupling communication slave chip further includes: and the oscillator module is connected with the demodulation module and used for providing a demodulation clock for the demodulation module.
Optionally, the oscillator module includes an oscillator and a programmable unit, where the oscillator is configured to provide a demodulation clock to the demodulation module, and the programmable unit is connected to the oscillator and is configured to correct a clock frequency of the oscillator.
Optionally, the magnetic coupling communication slave chip further includes a capacitor, one end of which is grounded, and the other end of which is connected to the rectification and voltage stabilization module, and is configured to filter ac ripples in the power signal output by the rectification and voltage stabilization module.
The transceiver can be simultaneously integrated in a plurality of main chips at the MCU side, so that the integration level of an electric meter system can be greatly improved, and the cost is reduced; and the transceiver can complete data communication with the slave chip and simultaneously provide power for the slave chip, so that two types of isolation of communication and power supply are realized, and the stability and reliability of the magnetic coupling communication system are improved.
Furthermore, the slave chip can not only obtain power supply and data signals from the master chip, but also respond to the data signals and send return signals to the master chip.
Drawings
FIG. 1 is a schematic diagram of a magnetically coupled communication system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a magnetically coupled communication system transceiver according to an embodiment of the present invention;
FIG. 3 is a signal diagram illustrating the communication protocol definition of a magnetically coupled communication system transceiver according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a magnetically coupled communication system according to an embodiment of the present invention;
FIG. 5 is a signal diagram illustrating a communication protocol definition for magnetically coupling a signal from a chip according to one embodiment of the present invention;
fig. 6 is a schematic structural diagram of a magnetic coupling communication system according to an embodiment of the present invention.
Detailed Description
The following describes in detail specific embodiments of the magnetic coupling communication main chip and the magnetic coupling communication system provided by the present invention with reference to the drawings.
Fig. 1 is a schematic structural diagram of a magnetic coupling communication system according to an embodiment of the present invention.
The magnetic coupling communication system comprises a magnetic coupling communication master chip 10 (hereinafter referred to as master chip 10) and a magnetic coupling communication slave chip 20 (hereinafter referred to as slave chip 10), wherein the master chip 10 provides a power supply VDD2 to the slave chip 20 and a slave end load through a transformer 30, and data communication between the two is realized, and meanwhile, electrical isolation is realized between the two. The transformer 30 is a coupling transformer.
The master chip 10 includes at least one magnetically coupled communication transceiver 11 (hereinafter referred to as transceiver 11), the transceiver 11 being used for transmitting power, data signals and receiving return signals from the slave chip 20. The main chip 10 may further include an MCU (micro control unit) 12, and the MCU12 may integrate the n transceivers 11 at the same time, which may greatly improve the integration level of the electric meter system. In other embodiments of the present invention, the MCU12 may also be an external chip of the main chip 10, and is not integrated with the transceiver 11 on the same chip.
The transceiver 11 is connected to the MCU12, and is configured to obtain a data signal TXD1 from the MCU12, send a control signal DIR1, and further transmit a received backhaul signal RXD1 from the chip 20 to the MCU 12.
Specifically, the transceiver 11 includes a modulation module 111, a transmission module 112, and a reception module 113. A modulation module 111, configured to form a modulation signal for modulating the data signal on the carrier signal and a single-frequency carrier signal according to different states of the transmission control signal DIR 1; the transmitting module 112 is connected to the modulating module 111, and is configured to convert the signal output by the modulating module 111 into a current signal and output the current signal to the main terminal 31 of the transformer 30; and the receiving module 113 is used for detecting the current of the main terminal 31 of the transformer 30, thereby obtaining a return signal of the chip to be isolated, namely the slave chip 20, and sending the return signal RXD1 to the MCU 12.
In this embodiment, the modulation module 111 may modulate the data signal TXD1 by using an FSK protocol, and modulate the data signal TXD1 on a carrier signal. In other embodiments, other protocols may be used to modulate the data signal TXD 1.
The transmission control signal DIR1 includes two states, one being a transmission state and the other being a reception state. When the control signal DIR1 is in a sending state, the modulation module 111 forms a modulation signal for realizing the transmission of a data signal; when the control signal DIR1 is in a receiving state, the modulation module 111 forms a carrier signal with a single frequency, and the receiving module 113 can detect the current change at the main terminal of the transformer 30, so as to receive the return signal from the chip 20.
Since the carrier signal is always present, the transmitting module 112 continuously provides power supply energy to the slave chip 20 by outputting the carrier signal to the master terminal of the transformer 30.
Fig. 2 is a schematic structural diagram of a transceiver 11 according to an embodiment of the invention.
The transmitting module 112 of the transceiver 11 includes: a control unit 1121 and a conversion unit 1122, wherein the control unit 1121 is configured to perform digital logic processing on a signal output by the modulation module 111 and output a digital control signal; the converting unit 1122 is connected to the control unit 1121, and configured to output a current signal matched to a characteristic of the signal output by the modulating module 111 to the main terminal 31 of the transformer 30 under the control of the digital control signal.
In this specific embodiment, the converting unit 1122 is an H-bridge full-bridge circuit composed of transistors M1-M4, the control unit 1121 outputs control signals phi1, phi1b, phi2 and phi2b, phi1 and phi1b are inverted signals, phi2 and phi2b are inverted signals, the 4 control signals are respectively used for controlling the on and off of the transistors M1, M2, M3 and M4, so as to control the current direction output to the main terminal 31 of the transformer 30 to flow from the TP terminal to the TN terminal or from the TN terminal to the TP terminal, and the two current directions respectively represent digital signals 1 and 0. In fig. 2, signal waveform examples of the control signals phi1, phi2 are also given.
In another embodiment of the present invention, the converting unit 1122 may be a half-bridge circuit or the like, and may have a circuit configuration capable of controlling the direction of the output current.
The receiving module 113 includes: a preprocessing unit 1131, configured to preprocess a detection signal of a current at a main terminal of the transformer 30; the amplifying unit 1132, connected to the preprocessing unit 1131, configured to amplify the signal output by the preprocessing unit 1131; a demodulation unit 1133, configured to demodulate the signal output by the amplification unit 1132, so as to obtain a backhaul signal RXD 1. The preprocessing unit 1131 may be configured to perform amplitude modulation processing on the detection signal.
In this embodiment, the power supply VDD1 of the converting unit 1122 is connected to the converting unit 1122 through a resistor Rs; the receiving module 113 is connected to the connection end of the resistor Rs and the converting unit 1122, so that when the current of the main end 31 of the transformer 30 changes, the converting unit 1122 obtains a common-mode detection signal, and removes level inversion and jump of the signal, thereby facilitating a subsequent circuit to process the detection signal.
Referring to fig. 3, a signal diagram defined for a communication protocol of the transceiver 11 is shown.
When the transmission control signal DIR1 is at a high level, the transceiver 11 is in a transmission state, and the modulation module 111 forms a signal with a frequency of F0, that is, the transceiver 11 transmits a signal with a frequency of F0 to the slave 32 of the transformer 30, which represents data 0; the modulation module 111 forms a signal having a frequency of F1, that is, the transceiver 11 transmits a signal having a frequency of F1 to the slave terminal 31 of the transformer 30, representing data 1, thereby implementing transmission of a data signal. When the transmission control signal DIR1 is low, the transceiver 11 is in a receiving state, the modulation module 111 forms a carrier signal with a single frequency F2, and the transceiver 11 transmits the carrier frequency F2 to the slave 31 of the transformer 30, and at this time, the slave 20 is not powered for data transmission, and the return signal is received from the slave 20.
The transceiver 11 is capable of providing power to the isolated slave chip 20 and enabling data communication under the control of the transmit control signal 11. And the transceiver 11 is suitable for being integrated with the MCU12, so that the integration level of the electric meter system can be greatly improved, the stability and the reliability of the electric meter system are improved, and the system cost is saved.
Fig. 4 is a schematic structural diagram of a magnetic coupling communication system according to an embodiment of the present invention.
In this embodiment, the slave chip 20 of the magnetic coupling communication system is connected to the slave 32 of the transformer 30, and is configured to receive power and data signals from the master chip 10 through the transformer 30 and send back a signaling signal to the master chip 10. The number of slave chips 20 and transformers 30 may be the same as the number of transceivers 11 within the master chip 10 or less than the number of transceivers 11.
Specifically, the slave chip 20 includes: a rectifying and voltage stabilizing module 21, a demodulating module 22 and a load modulating module 23.
The rectifying and voltage stabilizing module 21 is connected to the slave end 32 of the transformer 30, and is configured to extract a modulation signal from the slave end current of the transformer 30, rectify a carrier current in the slave end current of the transformer 30, and output a power signal VDD2 to supply power to the slave chip 20 and supply power to a load connected to the slave chip 20.
The demodulation module 22 is connected to the rectifying and voltage-stabilizing module 21, and is configured to demodulate the modulated signal to obtain a data signal RXD 2.
The load modulation module 23 modulates the signal TXD2 to be transmitted back by a load current modulation method, so that the current at the slave end of the transformer 30 is changed. The load modulation module 23 may change the current of the slave end 32 of the transformer 30 by changing the load current, and the current provided by the master end 31 of the corresponding transformer 30 may change along with the current of the slave end 32, so that the master chip 20 detects that the current of the master end 31 changes, and demodulates the detection signal to obtain the return signal. In one embodiment, the load modulation module 23 may adjust the load current by disconnecting or connecting the load, when the load is disconnected, the load current is 0, but since the slave end of the transformer 30 is an inductor, the slave end has a certain current change delay, and shows that the slave end current is small; when the load is connected, the current from the end is large; therefore, the signal is transmitted back through the amplitude change of the current from the end.
In this embodiment, the slave chip 20 further includes: an oscillator module 24 connected to the demodulation module 22 for providing a demodulation clock to the demodulation module 22.
In this embodiment, the slave chip 20 further includes a functional module 25, connected to the rectifying and voltage-stabilizing module 21, the demodulating module 22 and the load modulation module 23, and configured to obtain a power supply from the rectifying and voltage-stabilizing module 21, obtain a data signal RXD2 sent by the master chip 10 and a backhaul control signal DIR2 used for controlling a backhaul state from the demodulating module 22, and send a signal to be backhauled TXD2 to the load modulation module 23 in a specific state of the backhaul control signal DIR 2. The functional module 25 may be an independent functional circuit such as a metering circuit or a communication circuit, which needs to be electrically isolated from the MCU 12.
The slave chip 20 further includes a capacitor C, one end of which is grounded, and the other end of which is connected to the rectifying and voltage-stabilizing module 21, and is configured to filter ac ripples of the power supply VDD2 output by the rectifying and voltage-stabilizing module 21. The capacitor C may be integrated with the slave chip 20 or may be independent of the slave chip 20.
Fig. 5 is a signal diagram illustrating a communication protocol definition of a signal transmitted from the chip 20 according to an embodiment of the present invention.
When receiving a carrier signal of a single frequency F2 sent by the master chip 10, the slave chip 20 enters a signal return mode.
When the feedback data TXD2 is 0, the load current is adjusted by the load modulation module 23, so that the current at the slave end of the transformer 30 varies periodically, for example: the on load current corresponds to a high current of the slave end, the off load current corresponds to a low current of the slave end, and the periodic on and off load current forms a periodically-changed slave end current; when the feedback data TXD2 is 1, the load current of the slave chip 20 does not change, and the slave-side current of the transformer 30 does not change. The main chip 10 can therefore demodulate the return signal by detecting the load current.
Fig. 6 is a schematic structural diagram of a magnetic coupling communication system according to an embodiment of the present invention.
In this specific embodiment, the rectifying and voltage stabilizing module 21 of the slave chip 20 includes: a rectifying unit 211, configured to extract a modulation signal from the slave end current of the transformer 30, and rectify the carrier current in the slave end current of the transformer 30 into a direct current signal; and a voltage stabilizing unit 212, connected to the rectifying unit 211, for performing voltage stabilizing processing on the dc signal output by the rectifying unit 211 and outputting a power supply signal VLDO to the functional module 25. The rectifying unit 211 is further configured to output a power supply VDD2 for supplying power to a load.
The rectifying and voltage stabilizing module 21 further comprises a resistor R, an inverter D1 and an inverter D2 which are sequentially connected in series between one end TP of the slave end of the transformer 30 and the demodulating module 22, and is used for obtaining a modulated signal from the slave end current of the transformer 30 and aligning the modulated signal so as to be suitable for the demodulating module 22 to demodulate.
The functional module 25 is connected to the voltage stabilizing unit 212, the demodulation module 22 and the load modulation module 23, and is configured to obtain a power source signal VLDO from the voltage stabilizing unit 212, obtain a data signal RXD2 and a backhaul control signal DIR2 from the demodulation module 22, and send a signal TXD2 to be backhauled to the load modulation module 23 in a specific state of the backhaul control signal DIR 2.
The demodulation module 22 sends a corresponding backhaul control signal DIR2 to the functional module 25 according to whether a modulation signal is received or not, so as to control the receiving and backhaul status of the functional module 25. The feedback control signal DIR2 may be identical to or opposite to the transmission control signal DIR1 of the transceiver 11, for example, when DIR1 is high, the transceiver 11 is in a transmission state, the DIR2 is also high, and the slave chip 20 is in a reception state; when DIR1 is low, the transceiver 11 is in a receiving state, DIR2 is also low, the slave chip 20 is in a return state, and the functional module 25 sends a to-be-returned signal TXD2 to the load modulation module 23.
In this embodiment, the oscillation module 24 includes an oscillator 241 and a programmable unit 242, where the oscillator 241 is configured to provide a demodulation clock to the demodulation module 22; the programmable unit 242 is connected to the oscillator 241, and is configured to modify the clock frequency of the oscillator 241.
The slave chip 20 further includes a power-on reset module 26 connected to the rectifying unit 211 and a bandgap reference 27.
The above only partially exemplifies the structure of the slave chip 20, but the slave chip 20 may have other circuit structures without any limitation to the actual circuit structure of the slave chip 20.
In the following, a detailed implementation of the communication of the magnetic coupling communication system in one embodiment is briefly described with reference to fig. 2 and 6.
When the transmission control signal DIR1 is high, data TXD1 to be transmitted is modulated by the modulation module 111 and then is transmitted to the master terminal 31 of the transformer 30 through an H-bridge circuit formed by M1 to M4, the slave chip 20 receives an alternating current signal from the slave terminal 32 of the transformer 30, the coil proportion of the transformer 30 is adjusted, and the amplitude of the alternating current signal received by the slave terminal 32 is adjusted. The rectifying unit 211 of the slave chip 20 rectifies the ac carrier into a dc signal, and the voltage stabilizing unit 212 may extract power energy from the dc signal output by the rectifying unit 211 to supply the main current of the slave chip 20. The slave chip 20 extracts the modulated signal from the slave 32 of the transformer 30 and the demodulation module 22 extracts the modulated data signal RXD2 from the frequency modulated carrier signal.
When the transmission control signal DIR1 is low, the transceiver 11 transmits a single-frequency ac signal, the slave chip 20 can change its current consumption through the load modulation module 23, the slave-side current of the transformer 30 changes, the current transmitted by the H-bridge circuit of the transceiver 11 changes accordingly, the resistor Rs connected in series to the H-bridge of the transceiver 11 can detect the change in the slave-side current of the transformer 30, and then the signal is processed through the preprocessing unit 1131, the amplifying unit 1132 and the demodulation unit 1133 to obtain the return signal RXD 1.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (15)
1. A magnetically-coupled communications transceiver for providing electrical isolation from a chip to be isolated by a transformer, comprising:
the modulation module is used for respectively forming a modulation signal for modulating the data signal on the carrier signal and a single-frequency carrier signal according to different states of the transmission control signal;
the transmitting module is connected with the modulation module and used for converting the signal output by the modulation module into a current signal and outputting the current signal to the main end of the mutual inductor, and the transmitting module provides power for the chip to be isolated by outputting a carrier signal to the main end of the mutual inductor;
and the receiving module is used for detecting the current of the main end of the mutual inductor so as to obtain a return signal of the chip to be isolated.
2. A magnetically-coupled communications transceiver according to claim 1, wherein the modulation module modulates data signals using an FSK modulation protocol.
3. A magnetically-coupled communications transceiver according to claim 1, wherein the receiving module comprises: the preprocessing unit is used for preprocessing a detection signal of the current of the main end of the mutual inductor; the amplifying unit is connected with the preprocessing unit and used for amplifying the signal output by the preprocessing unit; and the demodulation unit is used for demodulating the signal output by the amplification unit to obtain a return signal.
4. A magnetically-coupled communications transceiver according to claim 1, wherein the transmit module comprises: the control unit is used for carrying out digital logic processing on the signal output by the modulation module and outputting a digital control signal; and the conversion unit is connected with the control unit and used for outputting a current signal matched with the characteristics of the signal output by the modulation module under the control of the digital control signal.
5. A magnetically-coupled communications transceiver according to claim 4, wherein the switching unit is an H-bridge full-bridge circuit or a half-bridge circuit.
6. A magnetically-coupled communications transceiver according to claim 4, wherein the power supply of the switching unit is connected to the switching unit via a resistor; the receiving module is connected to the connecting end of the resistor and the conversion unit.
7. A magnetically-coupled communication master chip, comprising:
a micro control unit;
at least one magnetically coupled communications transceiver according to any one of claims 1 to 6, connected to the micro control unit for acquiring data signals from the micro control unit, sending control signals and also for sending back transmission signals to the micro control unit.
8. A magnetically coupled communication system, comprising:
a magnetic coupled communication master chip according to claim 7;
the main end of the mutual inductor is connected with the magnetic coupling communication main chip;
and the magnetic coupling communication slave chip is connected with the slave end of the mutual inductor and is used for receiving a power supply and a data signal from the magnetic coupling communication master chip through the mutual inductor and sending a transmission signal back to the magnetic coupling communication master chip.
9. The magnetically-coupled communication system according to claim 8, wherein the magnetically-coupled communication slave chip comprises:
the rectification voltage stabilization module is connected with the secondary end of the mutual inductor and used for extracting a modulation signal from the current of the secondary end of the mutual inductor, rectifying the carrier current in the current of the secondary end of the mutual inductor and outputting a power supply signal;
the demodulation module is connected with the rectification voltage-stabilizing module and is used for demodulating the modulation signal to obtain a data signal;
and the load modulation module modulates the signal to be transmitted back in a load current modulation mode so as to change the current of the slave end of the mutual inductor.
10. The magnetically-coupled communication system of claim 9, wherein the rectifying and voltage-stabilizing module comprises: the rectification unit is used for extracting a modulation signal from the transformer slave end current and rectifying the carrier current in the transformer slave end current into a direct current signal; and the voltage stabilizing unit is connected with the rectifying unit and is used for stabilizing the voltage of the direct current signal output by the rectifying unit and outputting a power supply signal.
11. The magnetically-coupled communication system according to claim 10, wherein the magnetically-coupled communication slave chip further comprises: and the functional module is connected with the voltage stabilizing unit, the demodulation module and the load modulation module and is used for acquiring a power supply signal from the voltage stabilizing unit, acquiring a data signal and a return control signal from the demodulation module and sending a signal to be returned to the load modulation module in a specific state of the return control signal.
12. A magnetically-coupled communication system according to claim 11, wherein the functional module comprises: a metering circuit or a communication circuit.
13. The magnetically-coupled communication system according to claim 9, wherein the magnetically-coupled communication slave chip further comprises: and the oscillator module is connected with the demodulation module and used for providing a demodulation clock for the demodulation module.
14. A magnetically-coupled communication system according to claim 13, wherein the oscillator module comprises an oscillator for providing a demodulation clock to the demodulation module and a programmable unit coupled to the oscillator for modifying the clock frequency of the oscillator.
15. The magnetically-coupled communication system according to claim 9, wherein the magnetically-coupled communication slave chip further comprises a capacitor having one end connected to ground and the other end connected to the rectifying and voltage-stabilizing module for filtering ac ripples in the power signal outputted from the rectifying and voltage-stabilizing module.
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| CN112234976A (en) * | 2019-12-20 | 2021-01-15 | 青岛鼎信通讯股份有限公司 | 485 communication circuit based on magnetic isolation technology |
| CN111416784A (en) * | 2020-04-20 | 2020-07-14 | 无锡思泰迪半导体有限公司 | Digital signal modulation system and method |
| CN113556143B (en) * | 2020-04-20 | 2022-08-12 | 炬芯科技股份有限公司 | Communication method, communication circuit and communication system |
| CN112217401A (en) * | 2020-09-28 | 2021-01-12 | 青岛鼎信通讯股份有限公司 | Magnetic isolation power supply communication scheme based on digital modulation technology for electric energy meter |
| CN115112947A (en) * | 2022-07-26 | 2022-09-27 | 青岛鼎信通讯股份有限公司 | Electric energy meter, communication method, device and medium of metering chip and MCU |
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